Improvement in electric alarms



ADDI'S'IOIN Bitabronn, oFYZAMsT itRbaM, steam IMPROVEMENT IN ELECTRICALARMS.

Specification forming part of Letters Patent No. 181,905, datedSeptember 5, 1876; application filed July 12, 1876.

To all whom it may concern Be it known that I, ADDISON BRADFORD, ofAmsterdam, in the county of Montgomery, and in the State of New York,have invented certain new and useful Improvements in Electric Alarms anddo hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,and t0 the letters of reference marked thereon, making a part of thisspecification.

The nature of my invention consists in the construction and arrangementof an electric alarm, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawing, in whichFigure 1 is a front elevation of my invention. Figs. 2 and 3 arevertical sections of the same,'and Fig. 4 is a section of aregulating-screw used therein.

A represents a box, secured upon the base B, and having the gong Ostanding upon it.

v The gong is screwed on the upper end of a post or standard, D, thelower end of which is adjustable in a slotted plate, a, secured on thetop of the box A. Through the slotted plate a passes screw 1), whichruns up into the standard, the head of the screw being held fromturning, so as to unscrew the standard and move it,"as required, for thepurpose of regulating the stroke of the lever E. This leverstandsin anupright position,and is hung upon pivot-screws d d, passing through thesides of the alarm. On the back of the alarm there is an adjustableset-screw, G, running through and connecting with a small plate, 0, onthe lever. This screw has a movable slotted pin or plunger, h, in theend, said pin or plunger being prevented from coming out of the screw bymeans of a rivet passing through the slot therein. In the screw, back ofthe pin h, is a spiral spring, c, that holds the pin out to its fullextent, except when the lever pushes it in, for the purpose ofregulating the stroke.

Just above the screw G is a spring, k, to draw the lever E back from thebell. This spring is adjustable by means of the screw H, so as toregulate the tension of the spring. The shaft or journal upon which thearma- 'turelever is hung is from the armature toward the bell, so as toallow of placing the bell directly over the magnets I, and strikes thebell with the lever by the force given it by attraction of theelectro-magnets, giving a stroke opposite to the magnets instead oftoward them.

With the alarm is connected a time-piece for constant use, and soconnected with the alarm as to be used for a time-alarm. To the dial Jof the time-piece is fixed a rim, m, that may be easily turned by meansof the projecting point 12, so as to set the alarm at any desiredmoment.

One wire is connected with the works K of the time-piece, the dial Jcoming in contact with the other. When the hour-hand 19 comes in contactwith said point a it completes the circuit, causing the alarm to sound,and will continue to alarm until the hand has passed over the point ofconnection, or the switch or stop L, designating clock, is turned.

The stops or switches L L are for the purpose of connecting anddisconnecting the alarm and time-alarm, both acting separate, so thatone may be turned off without affecting the other. Through the innerends of these stops are passed pins 8 8, each of which has a wireattached to one end, and the other end turns against a screw-plate orpoint, t, to connect the two wires. 7

Upon the base B of the alarm are three binding-posts, M and N N, for thepurpose of applying the battery. The connection is made by connectingone pole of the battery to the post M, and two wires running from theother pole of the battery, are connected to the other two posts, N N.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. The adjustable screw G, provided with the movable pin h and spring2', substantially as and for the purposes herein set forth.

with stud n, magnets I, armature-lever E, ADDISON BRADFORD. [L. 8.] gongO, and switches L L, with the" 'n'eces TJWi'fiiesses:

sary electric connecting-wires, substantially W. H. JACKSON,

as and. for thevpu'npbsevsiheizir liSen'fimth; 1.. i 1515B. 'ERENGH.

